Effects - did swim do too much?

[sartre1985]

swim is very worried that he might have done too much adderall and that he has caused permanent damage. swim is at college and took 30 mgs his first time and read an entire book on soviet history. swim loved the way he felt on adderall and became very social on it. swim took 30 mgs on another occasion and had a great time at a party. a few weeks later swim buys a bunch of adderalls from a friend and snorts around 90 mgs over the course of a few hours. while on that much adderall swim experienced a sort of dizzy spell that worried him very much. his heart was pounding very hard and swim had a sort of panic attack while on this dose. the next day swim took 10 mg or adderall or so and went to school, had a dizzy spell in class and walked to the hospital. there he was checked out, had an ekg, was honest with the doctor that he had been using adderall and the doctor said swim was fine and he should switch to coffee. swim had another dizzy spell in class a day or so later, wasn't on adderall, but has been checked out again since and everything is fine.

is it possible swim did some kind of permanent damage to swim's brain by using adderall the handful of times he did, or by snorting a large amount (90 mgs) over the course of a few hours that one time? swim had no tolerance to adderall and swim knows he did too much but swim didn't know. using adderall felt good and swim took it a little too far.